A Pay Per Click program pays affiliates for referring raw hits, unique hits, and qualified hits.

Go to Program Admin, click the Create a New Disabled Program icon,
give the program a name and give a short name, and select Standard
Program from the Program Type drop-down.
In the checkboxes section, mark the Hide Joins box to hide the number of
Joins from the affiliate; mark Deduct Credits and Deduct Chargebacks to
not pay affiliates for referrals that result in credits or chargebacks.
Do not fill in the Payout Extension Desc and Extended Type boxes.
Select the sites to use the program.
In the Default Payouts section, fill in the Raw, Unq, and Qual fields to
set the payout for Raw Hits, Unique Hits, and Qualified Hits.